Round Cut Solitaire Stud Earring in Crown Setting

This item is a single stud-style earring featuring a prominent round-cut colorless stone, likely a diamond, cubic zirconia, or white sapphire. The stone is held securely within a decorative yellow-tone metal mounting, fashioned in a distinctive 'crown' or 'coronet' style setting. This setting features multiple rounded prongs that rise up to encircle the girdle of the stone, resembling the crenellations of a royal crown. The metal appears to be gold-toned, though without visible hallmarks, it is impossible to determine if it is solid gold (e.g., 10k or 14k) or gold-plated base metal. The stone exhibits a high level of brilliance and dispersion, suggesting a brilliant-cut faceting pattern. In terms of condition, the earring displays some surface grime and possible oxidation or tarnishing on the metal prongs, which is common for second-hand jewelry and can often be resolved with professional cleaning. The overall construction appears sturdy, reflecting a late 20th-century or contemporary manufacturing style. No maker's marks or metal purity stamps are visible in the provided image. The scale of the earring suggests a stone size approximately between 0.50 and 1.00 carat equivalent.